Metal shearing machine



Nov. 1, 1938. c. A. FRICK METAL SHEARING MACHINE Filed Sept. 50, 1935 INVENTOR. 6*fieJZOrH,Fr10i0,

ATTORNEYS Patented Nov. 1, 1938 UNITED STATES PATENT OFFICE METAL SHEARING MACHINE,

Chester A. Frick, Muncie, Ind. 7, 7 Application September so, 1935,, Serial No. 42,794

2 Claims.

My invention relates to improvements in metal shears and particularly to power operated metal shears. It is one of the objects of my invention to provide a power operated metal shearing apparatus which, from the standpoint of operation, may be used in cutting sheet metal in somewhat the same manner as a jig-saw may beused in cutting wood. 7

To this end, I provide a pair of shear blades, one of which maybe stationarily mounted and the other reciprocated at a relatively high speed relative thereto in order to make a more or less continuous shear through the metal which is fed between the shears. The reciprocating shear is preferably operated from a power device and the shears are so mounted, together with the power unit, that the device forms a complete unit which may be located on a bench, table, or other suitable support.

For the purpose of disclosing my invention, I have illustrated an embodiment thereof in the accompanying drawing in which:

Fig. 1 is a perspective view of a shear embody? ing my in'vention;

Fig. 2 is a longitudinal sectional view of the shear head;

Fig. 3 is a detail of the eccentric shaft for operating the head;

Fig. 4 is a detail perspective of the mounting for one of the shear blades;

Fig. 5 is a detail section showing the means for adjusting, vertically, the relatively stationary shear blade;

Fig. 6 is a perspective view of a supporting table for making a circular cut; and

Fig. 7 is a detail section of the means for clamping the material in the table illustrated in Fig. 6.

In the structure illustrated I provide a base I having extending forwardly therefrom an arm 2 on which is mounted the stationary shear blade. A second arm 3 overhangs the arm 2 and carries at its forward end the head for the reciprocating blade. This base and its associated arms are preferably formed in a single casting and the upper and lower arms 2 and 3 are suitably webbed to provide for sufficient strength to form rigid arms. The arm 3 has extending therethrough a hollow bearing portion 4 in which is adapted to be mounted the rotating operating shaft 5. This shaft operates within a pair of preferably bronze bushings 6 located in the hollow portion of the arm 3 and the shaft, at its forward end, receives a collar 1 pinned by a pin 8 to the forward end thereof. This collar operates against a shoulder 9 formed in' the bearing armand prevents lon-' gitudinal movement of the shaft. The rear end of the shaft projects beyond the rear face of the base 2 and is connected bya flexible coupling l 0 with an operating. motor II. This motor is 5 mounted on a suitable. base i 2 bolted on the rear face of the base I and forming in effect a rear extension thereof.

The forward end of the arm 3 is. provided. with a head l3 recessed on its front face to re- 10 ceive the reciprocatingknife carrier M which fits within this recessand is provided with a rear opening I5 adapted to'receive the eccentrically mounted end l6 of the shaft 5.- This end l6 operates in a suitable bushing l'l fitting within 15 the opening l5. The front end of the head is closed by a cover plate l8 bolted'to the head by suitable bolts l9 and the top of the head is closed by a cover plate 20. On each side ofjthe recess for the knife carrier I preferably relieve the face 20 of the knife carriergroove or recess and into these relieved portions I insert oil pads 2| which may be in the form of felt packing. At the top of this knife carrier recess I provide a groove into which fits a U-shaped felt pad 23 and in the 25 knife carrier l4 proper I provide an oil groove 24 extending vertically from the top thereof to the bushing IT. The top. of the knife carrier is spaced from the closure plate 20 thereby forming an oil chamber above the knife carrier into which 30 oil may be fed through the'oil cup 25 to maintain the knife carrier and its driving eccentric suitably lubricated. The bottom end of this knife carrier I4 is provided with a shear blade 26 which is provided at each end with a cutting edge 21 35 and on one face with serrated surfaces 28. An elongated slot 29 in the shear blade permits the passage therethrough of a holding bolt 30 which passes through a clamping washer 3|, likewise serrated on its face, and into the head. Due to the elongated slot in the shear blade, the blade may be adjusted vertically and held in its adjusted position by the engagingserrations on the blade and on the plate or washer 3|. As the blade is sharpened on its two edges, after one 45 edge becomes dulled, the other edge may be turned up to provide a cutting edge, thus permitting a prolonged use of the blade before resharpening is necessary.

This reciprocating shear blade 26 cooperates with a relatively stationary mounted shear blade 32 which is mounted on the front face of a vertically adjustable supporting anvil 33 mounted in a recess in the stationary head 34 at the front end of the arm 2. The anvil 33 is vertically 55 adjustable by means of a rotating cam 35 rotatably mounted at the bottom of the anvil and in a recess 36 formed on the bottom face of the anvil. This cam has one face 31, which maintains the anvil 33 in a raised or cutting position, and another face 38, which permits the anvil to drop to separate the knives 26 and 32 for the purpose of the insertion of work The front end of this cam is pivoted or journaled in a front closure plate 39 fastened to the front end of the head 34, which closure plate is provided with a bracket 40 adapted to have secured thereon a supporting table 4! through which the knife 32 is adapted to project and which provides a support for the work to be operated upon. This table is quite long, extending beyond-the shear blades at the front and towards the rear almost to the end of the throat-formed between the arms 2 and 3. The plate is provided with a snitv able sliding gauge 42 by which the work'may be adjusted on the table to get a suitable out.

In addition to the table 4| I provide a supplemental table or .workrholder for clamping the work in positionto obtain a circular cut. This work holder comprises a skeleton frame'having two pairs of bifurcated arms 43, the two arms being sufficiently separated to straddle the top head l3 and the lower head 34. Y The arms, when straddling these heads, are bolted to the heads by suitable bolts 44 which hold them in position and at their-forward ends the arms are connected to cross-braces 45. An additional pair of cross braces 46 and 41 are secured to the arms and a pair of rotatable clamps 48 and 49 are mounted on the cross braces 46 and 41. The upperclamp 5011s adjustable so that after the work is inserted in proper position with relation to the cutter knives, the clamp may be secured down on the work to hold the same securely in position, thus permitting the work to rotate relatively to the knives on the clamps as a center.

It will be noted that the work table 4| is inclined at an angle to the horizontal and that inclination corresponds to the inclination of the bevel of the shear blades. This is also true with respect to the work holder for the circular cut, illustrated in Fig. 6. The angle of this inclination is about fifteen degrees and I have found that by supporting the work inclined in this manner, a much cleaner cut is obtained.

I claim as my invention: a

1. In a metal .scroll shear, the combination with a pair. of vertically spaced arms, a head ;formed in the end of the upper arm, a shaft bearing formed in said arm, a shaft mounted in said bearing said head having a vertically ex- -,tending groove in the face thereof, a block slidably mounted in said groove, an eccentric pin .on.said-shaftrengaging said block, a blade carrier mounted in the lower end of said block, a

head slidably mounted at the end of the lower arm,..a blade carrier mounted on saidhea$1,.1a cam mountedin the end of-said low-er armand rotatable on a horizontal axis and supporting said lower arm head, said cam moving said lower arm head vertically when rotated.

2.'In.a metal :scroll shear, the combination withapair of vertically spaced arms a-h ad formed on the end of the upper arm, a shaft bearing formedin said. arm,. a shaft monntedin said bearing, said'head having a vertically extending groo-vein the face thereof, a block, slidably mounted in said groove, an eccentric pin on .said shaft engaging-said block, a blade carrier mounted at the lower endofsaid block, a head mounted at the end of said lower armhaving a vertical groove formedtherein, theblade carrier mountedin said groove, a cam mounted in saidgrooveand rotatable on a horizontal axis and adapted to support said blade carrier and move the same vertically upon the rotation of said cam.

CHESTER A. FRICK. 

